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Transcript
Section 13-2 Review Page #330:1-8 #1 Summarize the difference between mafic and felsic magma. Mafic Magma magnesium & iron dark less viscous Felsic Magma silica & feldspars light more viscous #2 Explain how the composition of magma affects the force of volcanic eruptions. More viscous magma traps gases more easily than less viscous magma, which may lead to more explosive eruptions. #3 Compare three major types of lava flows. • Pahoehoe – ropy • Aa – jagged • Blocky Lava – large chunks Pahoehoe Aa #4 Define pyroclastic material, and list three examples. Pyroclastic material consists of fragments of rock that form during an explosive eruption. Pyroclastic Material volcanic ash/dust volcanic bombs lapilli Volcanic Ash Bomb #5 Identify the three main types of volcanic cones. shield volcano cinder cones composite volcano Types of Volcanoes Shield Volcano Mauna Loa - Hawaii Cinder Cone http://video.google.com/videoplay?docid=5804326697533034741&q=cinder+cone+eruption&hl=en Composite Volcano http://video.google.com/videoplay?docid=3977416382972126736&q=mt+st+helens+eruption&hl=en #6 Describe how calderas form. A caldera forms when the magma chamber of a volcano empties, causing the volcanic cone to collapse in upon it, or when magma is ejected violently and the cone is destroyed. Caldera Crater Lake #7 List three events that may precede a volcanic eruption. earthquake activity rock temperatures increase volcano area bulges #8 Why would a sudden increase of earthquake activity around a volcano indicate a possible eruption. Sudden earthquake activity could be caused by magma moving upward through the rock around the volcano. The End On “Io” a moon of Jupiter
